The Verison device only allows four concurrent connections. The hotel I'm staying/teaching at wants $120.00/day for 12 Wi-Fi connections. I'm teaching this class for three weeks, so going that route is out of the question.

Anyone have any ideas as to how I can setup this equipment to get my PC's (12 total) connected to the Internet?

Seems to me that you could connect the Verizon unit to the USB port on the router (tether mode) and let the router do the work - I've not tested this. Then connect to the wireless on the router, not the Verizon unit.

I've tried doing what you described, but the router setup wants a pin number, a user id and a password; none of which are available to me. All I have is the SSID and passphrase. I thought if I connected the Jetpack via USB to my laptop, I could create an ad hoc network connection to the router via patch cable and use the Wi-Fi to the other laptops. So far, no joy...

I'm not sure how you've created the connection on your laptop. If your laptop is providing the internet services, DHCP, DNS etc then you should use the router in it's default config and connect the laptop to the WAN interface. If your laptop is just an internet gateway you'd use a LAN port. We really need to know what your laptop is doing with the internet connection.